Defect-related luminescence properties of hydroxyapatite nanobelts. (December 2020)

• Record Type: Journal Article
• Authors: Huerta, Verónica J.; Fernández, Paloma; Gómez, Virginia; Graeve, Olivia A.; Herrera, Manuel
• Is Part Of: Applied materials today. Volume 21(2020)
• Publication Date: 2020-12
• Subjects: Hydroxyapatite -- Point defect -- Luminescence -- Nanobelt -- Electron paramagnetic resonance; Materials science -- Periodicals; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1016/j.apmt.2020.100822
• Languages: English
• ISSNs: 2352-9407

Abstract

Highlights: We demonstrate that the formation of point defects such as hydroxyl ion vacancies (VOH−), calcium vacancies (VCa), and oxygen vacancies (VO) present in HAp nanobelts generates a strong luminescence in the visible and NIR ranges. Photoluminescence, cathodoluminescence, and electron paramagnetic resonance measurements validate the presence of these crystalline defects. Abstract: In this work, we study the generation of visible and near-infrared (NIR) luminescence associated with the formation of point defects in hydroxyapatite (HAp) nanobelts. Three different HAp samples were synthesized by a modified hydrothermal method at growth times of 24, 30, and 36 h. Transmission electron microscopy measurements revealed the presence of stacking faults in the nanobelts grown during shorter times. X-ray diffraction and Raman spectroscopy measurements confirmed the high crystalline quality of the samples, showing a hexagonal calcium deficient (Ca-D) HAp phase, supported by the Ca/P ratio of 1.2 and 1.3 revealed by X-ray photoelectron spectroscopy and energy dispersive spectroscopy measurements, respectively. Electron paramagnetic resonance, photoluminescence, and cathodoluminescence measurements demonstrated the presence of hydroxyl ion vacancies (VOH − ), calcium vacancies (VCa ), and oxygen vacancies (VO ) in HAp nanobelts generates a strong luminescence in the visible and NIR ranges. Graphical Abstract: Image, graphical abstract